As far as lighting, I think there's something odd (not sure how you could fix it) about the hat...either the threads in the white yarn are shiny or something because it seems to have a glow around the hat, but the baby's face (or maybe just the lips) is too dark.
I, personally, don't like the props used in this. The hat seems very Holiday or elf-like, the cup is very Spring/Summer and the warm wood tone of the floor just throws it off. Maybe if the hat were brighter colors, it wouldn't be so bad. I also don't like the fade-in from the edges of the picture. I know you only asked about the lighting, but I thought I'd give my opinion.